Zn→zns→zno→zn(oh)2→zncl2
1)Zn + S = ZnS 2)ZnS + H2O = ZnO + H2S 3)ZnO + NaOH = Zn(OH)2 + Na2O 4)Zn(OH)2 + 2HCl = ZnCl2 + 2H2O